method for converting isothioureas into guanidines was developed. The use of amine salts of bis(trifluoromethanesulfonyl)imide as a nitrogen source was found to induce an efficient conversion under weak acidic conditions at 50 °C. The conversion was applicable to the various amines and carbamate-protected thioureas, and various carbamate-protected cyclic guanidines were obtained in high yields. In particular
开发了一种将异
硫脲转化为
胍的有效方法。发现使用双(三
氟甲磺酰基)
酰亚胺的胺盐作为氮源可在 50 °C 的弱酸性条件下诱导有效转化。该转化适用于各种
胺类和
氨基甲酸酯保护的
硫脲,高产率得到各种
氨基甲酸酯保护的环
胍。特别是,双(三
氟甲磺酰基)
亚胺铵盐是一种有用的 N1 源,用于构建单保护的环
胍。